Wind screen



Febfll, 1936.` A. KNECHT 2,030,258

` WIND SCREEN Filed NOV. l2, 1954 Fig.5 N

y v y Zz-Lre/z Zai' Patented Feb. 11, 1936 UNITED STATES PATENT OFFICE 'Application November' 12, 1934, Serial No. 752,735

' In Germany January 17, 1934 3 Claims.

The invention relates to windscreens and more particularly to windscreens of motor-vehicles with closed bodies.

One object of the invention is to provide means to prevent the condensation of moisture on the windscreens.

Another object is the provision of means to make or to keep the windscreens dry, even if the temperature in the body of the vehicle is above that of the air surrounding said vehicle.

A further object is the provision of means to keep the side panels dry and free from condensed water.

I attain these and other objects by the use of two panes of glass or the like, said panes being arranged at a certain distance one behind the other and a preheated air ow passing between these two panes.

For the detailed description of my invention reference may be had to the following specication and the accompanying drawing forming a part thereof, wherein:

Fig. 1 is a side-elevation, partly cut out of an enclosed motor vehicle equipped with a device embodying my invention, Fig. 2 is a cross-section on the line B-B of Fig. 1, I

Fig. 3 is a front view of a motor vehicle equipped with a device according to a modi- 30, cation of my invention.

Fig. 4 is a longitudinal vertical section on the line C-C of Fig. 3.

Fig. 5 is a view on a larger scale of the end of the passage-way conducting air to the air space between the double windscreen.

Referring now more particularly to the modification shown in Figs 1 and 2 of the drawing a indicates a windscreen, b a second pane disposed at a small distance behind said windscreen a. Pane b can be made of glass or any other transparent material and is fastened at the bottom and at the top to ledges c, d, which are themselves fixed to the frame e of the windscreen a. It will be noticed that pane b is not fastened on yits sides but that there are provided lateral slots f, g through which air can flow from the space between the two sheets of glass to the interior of the car. The slots f, g preferably extend over 50 the whole height of the windscreen. Along the two lateral edges of the windscreen a guide plates or wings h., z' are provided to conduct the air, fed

A to the space between the two panes a and b by a passageway k and slot l on the two side panels 55 m, n.

(Cl. ,Z0-40.5)

The air flow between the two sheets of glass a and b forms a so-called sealing layer. The slightly preheated air flowing at a moderate speed provides a complete and thorough vaporization of water condensed on one of the panes a or b. Moreover the air heats said panes to such a degree that any condensation becomes impossible. The guide plates lc, i are ofr such a form. that the air flow passes over the side panels m, n and prevents the precipitation of water thereon. 10 In any case the inner sides of the windscreen and of the side panels are kept clean and dry whereas other means, not forming an object of this invention are provided'to keep the outside of the windscreen clean. 15

The. passageway lc leads from slot Z below the bonnet o to a cone p arranged behind a fan q. The latter draws fresh air through the radiator 1' and feeds it to the cone p whose larger end points forward in the direction of progress of the 20 vehicle.

According to a second modification of my invention the second pane t arranged at a small distance behind the wind screen s is provided with a pane u being xed by any suitable means 25 on the frame v of the windscreen. One lateral ledge of the frame o is either thinner than the rest of the frame or left away entirely so as to provide a slot Z, by which slot the airow leaves the double windscreen as indicated by arrow I 30 close by the rounded corner-edge v as clearly shown in Fig. 4. The passageway or tube w opens into the space between the two windows at the side opposite to slot Z, and conducts slightly pre-heated air into said space. The air owing in tube w is slightly preheated in comparison with the fresh air surrounding the vehicle, because it takes up some heat when passing through the radiator. A further increase in temperature could be obtained by leading tube w near to the exhaust pipe so that the hot gases of the combustion chambers impart heat to the air flowing in tube w. Abovev the opening of passageway w a shield or ring y is so arranged as to lead the air against the windscreen s in order to impart more heat to same than to the second pane t.

In the case of the first and of the second modification as well the slightly pre-heated air leaving the double windscreen may be'used to heat a the interior of the automobile. The air in same is thereby, especially at the surfaces of one or both of the side panels, kept on a' temperature which excludes the condensation of moisture and allows an increase of the humidity of the air.

Cil

2 A aoeopee l am aware that double windscreens between which heated air is introduced and having outlets for such heated air at the top or bottom for the purpose primarily of utilizing the heated air for heating the interior of the automobile, are Well known. The present invention is, however, to be distinguished therefrom in the fact that in the construction described the heated air is passed as a flat layer along and over the side panels of the vehicle immediately following the passage of such Vair from the double Windscreen. Thus the heated air is utilized not only for maintaining the Windscreen proper dry and free from condensed water but is also utilized as a means `for maintaining one or both of the side panels equally dry and free of condensed water in addition to the ordinary heating of the interior of the car.

What I claim as new and desire `to secure by Letters Patent is:

1. A Wind screen for motor vehicles comprising a windshield proper, a transparent section arranged inwardly of and spaced from the Windshield proper, means for introducing heated air into said space, `the space between the windshield proper and said transparent section being provided with an outlet at at least one vertical edge to direct the escaping heated air from the space between the windshield proper and the transparent section into owing contact with at least one of the side panels of the car, whereby to utilize such heated air to maintain such side panel or panels substantially dry and free of condensation.

2. A Wind screen for motor vehicles comprising a wind-shield proper, a transparent section arranged inwardly of and spaced from the Windshield proper, means for introducing heated air into said space, outlets from said space extending throughout the vertical edges of the wind screen to permit the heated air to escape rearwardly from the space with respect to the windshield proper, and guides carried by the inner transparent section and extending throughout the vertical dimension of the outlets to deect the heatedair towards the sides of the Vehicle.

3. A windscreen for motor vehicles comprising a Wind-shield proper, a transparent section arranged inwardly of and spaced from the wind-- shield proper, means for introducing heated air into said space, there being provided at least one outlet from said space extending substantially throughout the corresponding lateral edge of the windscreen and located closely adjacent the side part of the vehicle frame supporting the windscreen, whereby the heated air passing through said outlet is directed in owing contact with the surface of the adjacent side panel of the vehicle.

ALBERT KNECHT. 

